Brooks vs Nike Shoe Size - Which Runs Smaller?
Brooks runs about 1 US size large compared to Nike. If you wear Brooks in US 9, start by checking Nike in US 10. Both brands use the same foot-length measurement; the difference is in the last shape, not the conversion formula.
Brooks to Nike size chart
| US Men (Brooks) | Brooks -> Nike | Foot length |
|---|---|---|
| 7 | 8 | 246mm |
| 8 | 9 | 254mm |
| 9 | 10 | 262mm |
| 10 | 11 | 271mm |
| 11 | 12 | 279mm |
Fit verdict
- Brooks: True to size (65% of buyers)
- Nike: Runs small (55% of buyers)
Why the sizes differ
Brooks runs about 1 US size large compared to Nike, with roughly 6mm between the matched fit records.
Brooks foot length is measured in millimetres, then mapped to US size. The Nike starting size shifts by about 1 US size because of each brand fit bias, not a different conversion formula.